essentially changing the tranny fluid is exactly the same as oil theres a filter there too if automatic but its like from the dealer its probably ok and was probably changed by the dealer up to you if you want to do the whole thing though other than that youre just pouring the new stuff back down the dipstick hole youll need a funnel or some people use a funnel with a tube on it get creative try not to overfill or youll be doing it all again put in a certain number of quarts stop check it then add a or a full one check it etc